Click on image to view larger version.
Fig. 2. Effect of corn rootworm (CRW)-resistant transgenic corn engineered to express Bacillus thuringiensis toxin (Bt) and the insecticide tefluthrin (I) on microbial respiration in bulk (B; open symbols) and rhizosphere (R; closed symbols) soil sampled at anthesis in 2001 and 2002. The 2002 rhizosphere respiration for Bt and non-transgenic isoline (NoBt) is estimated by a solid line; that for NoBt + I is estimated by a dotted line. Rhizosphere data were not available in 2001. Error bars represent one standard deviation from the mean.
